Which of the following statement is true about the grazing incident technique used to evaluate surface flatness?Statement 1: Grazing incidence design turns rough surface into polished mirror surface to facilitate measurement.Statement 2: It is important to prevent test beam to strike at grazing angle for measurement performance.

Which of the following statement is true about the grazing incident t

1.	Which of the following statement is true about the grazing incident technique used to evaluate surface flatness?Statement 1: Grazing incidence design turns rough surface into polished mirror surface to facilitate measurement.Statement 2: It is important to prevent test beam to strike at grazing angle for measurement performance.
A.	F, F
B.	T, T
C.	F, T
D.	T, F
Answer» E.